Tollef Fog Heen's blog

Russel Coker writes about using multiple Ethernet devices in Xen and wonders about if there is something similar to RFC1918 addresses, but for Ethernet. Apparently, there is, they're called "Locally Administered Addresses". To make a local address, just set the seventh bit to one. You probably want to make the eigth bit a zero too, unless it's a multicast address. Wikipedia has more, as usual.